Police on Tuesday registered First Information Report (FIR) against unknown person in the case of missing bullet-proof jacket of former ATS chief Hemant Karkare.

The FIR was registered by JJ Marg Police Station in south Mumbai on an order passed by Mazgaon Metropolitan Magistrate following a complaint made by a social activist. The magistrate had ordered the police to probe the missing jacket of Karkare and file an FIR.